* gcse.c (cprop_cc0_jump): Function deleted.
(cprop_jump): Take an additional argument which is the possibly
NULL cc setting insn immediately before the conditional jump.
When a MODE_CC set is present, substitute it into the JUMP_INSN
before attempting the constant propagation.
(cprop_insn): Recognize cc setters followed by conditional jumps
as a special case. Use cprop_jump instead of cprop_cc0_jump.
(cprop_one_pass): Call bypass_conditional_jumps if altering jumps.
(find_bypass_set): New function based upon find_avail_set used by
cprop, but finds constant expressions available at the end of
basic blocks.
(bypass_block): New function. Given a basic block that begins
with a conditional jump and multiple incoming edges, perform
the jump bypass optimization.
(bypass_conditional_jumps): New function. Call bypass_block with
each suitable basic block in the CFG using a simple single pass.
From-SVN: r54152
